FormatDateTime() does not work in automations

When using FormatDateTime in a notice in an automation, the function does not work - it only returns digits. I realize that this function is undocumented, but we live in Europe and if we send dates like 10/3/2021 people will show up in October instead of in march, so as long as the localization isn’t properly taken care of, we need something. Perhaps it is possible to fix this on your end?